"you have to wash it properly!" my older sister, who always treats me like a child, comes into the bathroom and peels back my foreskin to wash my dick. even if we're siblings, i can't help but get hard from being stimulated so directly. suddenly, her eyes, which were full of kindness until a moment ago, turn into a lewd woman's lustful gaze... the bathroom instantly becomes a sexy atmosphere! despite thinking it's wrong, we are dominated by that lewd atmosphere and do a little fucking right there, and then go back to the room and have full-blown sex.